package com.king.web.controller.common;


import com.google.code.kaptcha.Producer;
import com.king.common.config.KingConfig;
import com.king.common.constant.CacheConstants;
import com.king.common.constant.Constants;
import com.king.common.core.controller.BaseController;
import com.king.common.core.domain.AjaxResult;
import com.king.common.core.redis.RedisCache;
import com.king.common.utils.uuid.IdUtils;
import com.king.system.service.ISysConfigService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Base64;
import java.util.concurrent.TimeUnit;

/**
 * 验证码操作处理
 */

@RestController
public class CaptchaController  extends BaseController {
    @Autowired
    private Producer captchaProducer;

    @Autowired
    private Producer captchaProducerMath;

    @Autowired
    private RedisCache redisCache;

    @Autowired
    private ISysConfigService configService;

    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public AjaxResult getCode(HttpServletResponse response){
        AjaxResult ajaxResult = AjaxResult.success();
        boolean captchaEnabled = configService.selectCaptchaEnabled();
        ajaxResult.put("captchaEnabled", captchaEnabled);
        if (!captchaEnabled) {
            return ajaxResult;
        }
        //保存验证码信息
        String uuid = IdUtils.simpleUUID();
        String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + uuid;

        String capStr = null, code = null;
        BufferedImage image = null;

        // 生成验证码
        String captchaType = KingConfig.getCaptchaType();
        if ("math".equals(captchaType)){
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        }else if("char".equals(captchaType)){
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }
        redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try{
            ImageIO.write(image,"jpg",os);
        } catch (IOException e) {
            return AjaxResult.error(e.getMessage());
        }
        ajaxResult.put("uuid", uuid);
        ajaxResult.put("img", Base64.getEncoder().encodeToString(os.toByteArray()));
        return ajaxResult;
    }
}
